Astronomy Picture of the Day

   [1]Discover the cosmos! Each day a different image or photograph of our
      fascinating universe is featured, along with a brief explanation
                    written by a professional astronomer.

                              2021 September 8
   [2]The picture shows a deep wide field image surrounding the Andromeda
   galaxy M31). Please see the explanation for more detailed information.

                        The Deep Sky Toward Andromeda
               Image Credit & [3]License: [4]Stefan Ziegenbalg

   Explanation: What surrounds the Andromeda galaxy? Out in space,
   [5]Andromeda (M31) is closely surrounded by several small [6]satellite
   galaxies, and further out it is part of the [7]Local Group of Galaxies
   -- of which our Milky Way galaxy is also a member. On the sky, however,
   gas clouds local to [8]our Milky Way appear to surround M31 -- not
   unlike how water clouds in [9]Earth's atmosphere may appear to
   [10]encompass our Moon. The [11]gas clouds toward Andromeda, however,
   are usually too faint to see. Enter the [12]featured 45-degree long
   image -- one of the deeper images yet taken of the [13]broader
   Andromeda region. This image, sensitive to light specifically
   [14]emitted by hydrogen gas, shows these faint and unfamiliar clouds in
   [15]tremendous detail. But the image captures more. At the image top is
   the [16]Triangulum galaxy ([17]M33), the third largest galaxy in the
   [18]Local Group and the furthest object that can be seen with the
   unaided eye. Below M33 is the bright Milky-Way star [19]Mirach. The
   image is the digital accumulation of several long exposures taken from
   2018 to 2021 from [20]Pulsnitz, [21]Germany.

                       Tomorrow's picture: open space
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    Authors & editors: [33]Robert Nemiroff ([34]MTU) & [35]Jerry Bonnell
                                 ([36]UMCP)
          NASA Official: Phillip Newman [37]Specific rights apply.
              [38]NASA Web Privacy Policy and Important Notices
                A service of: [39]ASD at [40]NASA / [41]GSFC
                           & [42]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2109/M31WideField_Ziegenbalg_1400.jpg
   3. https://creativecommons.org/licenses/by-nc-sa/2.0/
   4. http://www.simg.de/
   5. https://en.wikipedia.org/wiki/Andromeda_Galaxy
   6. https://en.wikipedia.org/wiki/List_of_Andromeda's_satellite_galaxies
   7. https://en.wikipedia.org/wiki/Local_Group#Component_galaxies
   8. https://solarsystem.nasa.gov/resources/285/the-milky-way-galaxy/
   9. https://climate.nasa.gov/news/2919/earths-atmosphere-a-multi-layered-cake/
  10. https://apod.nasa.gov/apod/ap210119.html
  11. https://apod.nasa.gov/apod/ap170104.html
  12. http://www.simg.de/nebulae3/and-lac.html
  13. https://apod.nasa.gov/apod/ap170303.html
  14. https://en.wikipedia.org/wiki/H-alpha
  15. https://image.shutterstock.com/image-photo/wide-eyed-double-dapple-dachshund-260nw-1057810916.jpg
  16. https://www.nasa.gov/feature/goddard/2019/messier-33-the-triangulum-galaxy
  17. https://apod.nasa.gov/apod/ap191231.html
  18. http://www.atlasoftheuniverse.com/localgr.html
  19. https://en.wikipedia.org/wiki/Beta_Andromedae
  20. https://en.wikipedia.org/wiki/Pulsnitz
  21. https://en.wikipedia.org/wiki/Germany
  22. https://apod.nasa.gov/apod/ap210907.html
  23. https://apod.nasa.gov/apod/archivepix.html
  24. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  25. https://apod.nasa.gov/apod/lib/aptree.html
  26. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  27. https://apod.nasa.gov/apod/calendar/allyears.html
  28. https://apod.nasa.gov/apod.rss
  29. https://apod.nasa.gov/apod/lib/edlinks.html
  30. https://apod.nasa.gov/apod/lib/about_apod.html
  31. http://asterisk.apod.com/discuss_apod.php?date=210908
  32. https://apod.nasa.gov/apod/ap210909.html
  33. http://www.phy.mtu.edu/faculty/Nemiroff.html
  34. http://www.phy.mtu.edu/
  35. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  36. http://www.astro.umd.edu/
  37. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  38. https://www.nasa.gov/about/highlights/HP_Privacy.html
  39. https://astrophysics.gsfc.nasa.gov/
  40. https://www.nasa.gov/
  41. https://www.nasa.gov/centers/goddard/
  42. http://www.mtu.edu/